 You've obviously got the blast coming out of the muzzle 20 inches further, or a 20-inch barrel, so it's much further away from you. But another thing that's happening is you've got more velocity because of that barrel, so that it definitely is going supersonic, and you're getting a crack with it out of .357. Maybe not with .38, but with .357. So the muzzle blast is reduced, and you're actually able to hear the thwack of that bullet going supersonic.